To determine which of the following animals does not excrete urea, we need to analyze the excretory systems of each option provided.

1. **Adult amphibians**: These animals primarily excrete urea. However, in their larval stages (like tadpoles), they may excrete ammonia.

2. **Insects**: Insects usually excrete waste primarily in the form of uric acid, not urea. This adaptation helps conserve water, making it more suitable for terrestrial life.

3. **Mammals**: Mammals typically excrete urea as their form of nitrogenous waste.

4. **Elasmobranchs** (like sharks and rays): These animals also primarily excrete urea, which plays a role in their osmoregulation.

### Final Answer
**Insects** do not excrete urea; instead, they excrete uric acid.

Question

To determine which of the following animals does not excrete urea, we need to analyze the excretory systems of each option provided.

1. **Adult amphibians**: These animals primarily excrete urea. However, in their larval stages (like tadpoles), they may excrete ammonia.

2. **Insects**: Insects usually excrete waste primarily in the form of uric acid, not urea. This adaptation helps conserve water, making it more suitable for terrestrial life.

3. **Mammals**: Mammals typically excrete urea as their form of nitrogenous waste.

4. **Elasmobranchs** (like sharks and rays): These animals also primarily excrete urea, which plays a role in their osmoregulation.

### Final Answer
**Insects** do not excrete urea; instead, they excrete uric acid.

Knowee AI · Accepted Answer

To determine which of the following animals does not excrete urea, we need to analyze the excretory systems of each option provided.

1. **Adult amphibians**: These animals primarily excrete urea. However, in their larval stages (like tadpoles), they may excrete ammonia.

2. **Insects**: Insects usually excrete waste primarily in the form of uric acid, not urea. This adaptation helps conserve water, making it more suitable for terrestrial life.

3. **Mammals**: Mammals typically excrete urea as their form of nitrogenous waste.

4. **Elasmobranchs** (like sharks and rays): These animals also primarily excrete urea, which plays a role in their osmoregulation.

### Final Answer
**Insects** do not excrete urea; instead, they excrete uric acid.

Which of the following animals does not excrete urea?Multiple choice question.Adult amphibiansInsectsMammalsElasmobranchs

Question

Which of the following animals does not excrete urea?

Solution

Final Answer

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